Which hydrocarbon will provide more heat when allowed to react with oxygen? hint: use the heat of combustion data in the alkane properties table. c6h14 c6h12 c2h6 c3h8

Combustion reactions are endothermic reactions which means they release heat as the reaction proceeds to completion. To determine which hydrocarbon would provide more or release the most heat when allowed to react with oxygen, we need the values of the heat of combustions of the compounds given above. From literature, we would find the following values.

C6H14 = -4163.2 kJ /molC6H12 = -3919.6  kJ /mol
C2H6 = -1560  kJ /mol
C3H8 = -2220.1 kJ /mol

The negative value would represent that the certain value of heat is being released during the reaction. From the list, C6H14 would be the one to provide the most heat.

n N2(g) = 15.367 mol

Explanation:

airbags generally vary between 35 and 60 liters in volume and for the airbag system to activate, it takes about 20 Kgf/cm² of pressure; with this data taken from literature and knowing the temperature of reaction (495 °C), we determine the moles of nitrogen needed from the ideal gas law.

ideal gas law:

PV = RTn

∴ P = 20 Kgf/cm² * ( 0.9678 atm / Kgf/cm² ) = 19.356 atm

∴ V = 50 L average volume

∴ R = 0.082 atm * L / K * mol

∴ T = 495°C + 273 = 768 K

⇒ n = PV / RT

⇒ n = ((19.356 atm) * (50 L)) / ((0.082atm*L/K*mol) * (768K))

⇒ n = 15.367 mol N2(g)